British Gas customers will need to be quick if they want to get their hands on a Sky voucher

Britain’s biggest energy supplier – which has around 11million customers – said that this is the first freebie being offered as part of its new rewards scheme, and that future rewards will be rolled out later in the year.

The offer, which launched quietly this morning, is open to less than 2 per cent of customers.

The Sun Online first reported in February how the scheme would include an “industry-leading collaboration with Sky”.

Now it has been confirmed that the first 150,000 people who sign up and claim the offer within the next two weeks will get a free Sky store movies voucher – even if they’re not a Sky customer.

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Customers can find details of how to sign up by logging onto their account online (or signing up if they don’t have one).

Once signed up, customers will be able to take part in future rewards as they are rolled out, which will include “large discounts” for loyal customers, as well as deals on boiler servicing, wireless heating controls and insurance products.